Aggregation states and molecular motion in amphiphilic poly(amido amine) dendrimer monolayers on solid substrates

Keiji Tanaka, Shiyu Dai, Tisato Kajiyama, Keigo Aoi, Masahiko Okada

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25 Citations (Scopus)

Abstract

Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, αa-, αH(2)O- and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.

Original languageEnglish
Pages (from-to)1196-1202
Number of pages7
JournalLangmuir
Volume19
Issue number4
DOIs
Publication statusPublished - Feb 18 2003

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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